Until early 1856 similar foreign coins passed as legal tender in the united states. Ship captains imported them and spent them for supplies and as wages for their workers. Bankers imported them and put them in circulation and profited from the difference in costs and what they spent for. This trade in foreign coins was for copper and silver coins. Gold of any size spent freely. By buying worn coins at a discount and spending them at face value it was well worth their while.
It would be cool among the same lines as the "Where's George" dollar bills to be able to do it with coins. Impossible, but cool.